题目

一根长2m的长方体木条，横截面是边长为5cm的正方形。制作400根这样的木条需要木材多少立方米?合多少立方分米？ 答案：解：5÷100=0.05（m） 0.05×0.05×2×400 =0.0025×2×400 =0.005×400 =2（立方米） =2000立方分米 答：制作400根这样的木条需要木材2立方米，合2000立方分米。根据中文提示及句意完成句子.【1】Mary’s father works hard to __________(改善) their lives.【2】Our government is trying to make our living __________(条件) better.【3】Air _____________ (污染) is the worst problem now. Something must be done to stop it.【4】The Internet makes _______________ (交流) much easier and faster【5】I have ________ (借) the book written by Mo Yan for a week.